Calling device.



o. F. Fonsseaef CALLING DEVICE.

APPLICATION min 056.29. 1916.

1 ,286.982. Patented Dec. 10, 1918.

lm/en fak- Oscar EForskerq.

mn J Af/jn UNITED STATES PATENT OFFICE.

.Oso n r. FORSBERG, 0r ,YoNKnRs, NEW YORK, AssIoNo'n 'ro WESTERN-ELECTRIC o MPANY, INCORPORATED, OF NEW YORK, n. Y., A CORPORATION OF NEW YORK.

CALLING DEVICE.

Specification ofLetters I'atent.

Patented Dec. 10, 191,8.

Application filed December 29, 1916. Serial No. 139,528.

State of New York, have invented certain new and useful Improvements in Calling Devices, of which the following is a full, clear, concise, and exact description.

This invention relates to calling devices, and more particularly to impulse senders for automatic and semi-automatic telephone systems, in which. the selector switches used for the building up of a connection are directively controlled by current impulses sent from a subscribers station, or anoperators position.

The Obj ect of this invention is to provide a new and improved calling device of the locking dial type: In senders of this type that have been developed, the locking and unlockin of, a slid ng movement, parallel to the axis of the sender. In the sender of this invention the locking and unlocking is accomplished without such sliding movement, and the invention contemplates the provision of means under the control of the finger stop for locking the dial andthe impulse sending mechanism. This means consists of a rocking arm which, in its normal position, locks the impulse mechanism, and allows the dial to'be o erated, and in its alternate'position locks t e dial inits operated position, and releases the impulse mechanism to transmit impulses in accordance with the position to which the dial has been moved. This rocking arm hasan extension which engages a cam on the finger stop, so that, when the stop is engagedby the finger, it moves the rocking arm from its normal position to its alter- V nate position, and when the impulse mechanism comes to rest after transmitting the impulses it actuates means to restore the rocking arm to its normal pos1tion,'in whlch it unlocks the dial and locks the impulse mechanism.

More specifically, a rocking lever having a pair of pawls is provided. In the normal position of the lever one of the awls locks the impulse wheel which is loose y mounted on the shaft of the sender but connected thereto by a spiral spring so as to tend to follow the shaft when rotated. In its alterhaabeen accomplished by means nate position the lever releases'suchwheel and looks a wheel ri id on the shaft to which the dial is also t astened. This lever. is rocked' so as to free the impulse wheel and engage the locking wheel by a finger stop which is moved as it is struck by the finger at the end of the setting movement of the dial, whereupon the impulse wheel is released and t e locking wheel locked. The impulse'wheel being under tension, due to the'rotation of the dial, follows the locking wheel. When the impulse wheel has moved a distance corresponding to the movement of the dial it is stopped, and actuates means for again rocking the lever to its normal. position.

Another feature is the provision ofm'eans whereby the finger dial and the impulse sending mechanism are only rotatable in one direction.

Other new and useful features of this invention will appear from the following detailed description and claims.

In the drawings Figure 1 is a front view of the calling device with the finger dialand front of the frame removed; Fig. 2 is a 1 sectional view on the line 22 ofFig. 1; Fig. 3 is a back view of the calling device; and Fig. 4 is a perspective view of the different parts of the calling device.

The calling device consists of a frame 1, in which a shaft 2 is rotatably mounted. A

dial 3 is fastened to one end of the shaft 2 and is actuated by means of finger holds 4 provided around its periphery.

Fastened to the front of the frame 1 is a ring 5, carrying characters such as numerals 0--9, each of said characters corresponding to one finger hold 4. A locking wheel 6 with notches 7 about its periphery is rigidly secured to the shaft 2. A short punched slot 8, concentric with the shaft, is provided in the locking disk 6, and anarm, 9 of aflat passes therethrough. A light spiral sprin 11 has one end fastened to the arm 9 an the other end to the locking wheel 6. This spring tends to keep the arm 9 against the end of the slot 8 which we will call the back disk 10, rotatably mounted on the shaft 2,

of the slot, namely, the end of the slotin the direction opposite to that of the rotation of the shaft, which is clockwise, but is prevented from assuming this positionas will appear hereinafter. The end of the slot in the direction of rotation will be called the front end of the slot. To the disk 10 is rigidly secured a cam plate 12 having 11 inclined teeth or cams.

A cup shaped sleeve 13 is rotatably mounted on the shaft 2, and to one end of this sleeve is attached a spiral spring 11, the other end of which is attached to the shaft. 2. A governor actuating wheel 16 and an impulse wheel 17 are rigidly secured to the sleeve 13.

A double-ended pawl 18 mounted on the rod 19 fastened 1. One end of enter the teeth of the impulse wheel 17, and theother end 20 is arranged to enter the teeth of the locking disk 6. A fiat spring 21 tends to keep the end 20 in the teeth of the locki'ng disk 6, and the other end 70 is so constructed as to be out of the teeth of the impulse wheel 17 whenever the end 20 is in the teeth of the locking disk 6, and vice versa.

A finger stop 22 is rotatabl v mounted on the shaft 2, between the dial 3 and the front of the frame. A spring 23 normallykeeps an arm 24 of stop 22 against the back end of a slot 25 in the frame 1. Two cams 26 and 27 are formed in the finger stop Cam 26 servesnormally to keep the pawl 29 out of engagement with the teeth of ram plate 12. A fiat spring 30 serves to move the pawl 29 into engagement with cam late 12 when the finger stop 22 is rotated rom its normal position.v The arm 31 of the pawl 29'is thereby moved into the notch behind the cam 26, thus holding the lever 22ilocked.

Cam 27 normally'engages an arm 32 of the pawl 18 to keep the end 70 thereof in engagement with the teeth of impulse wheel 17 and the other end thereof 20 out of engagement with the teeth of locking disk 6. Another arm 14 of the pawl 18 carries an insulating roller 13 which is normally held in position by a cam 27 for keeping a contact open between s rings 11 and -12.

A pawl 33 pivota lymounted on a rod 36 is held in engagement with the teeth of the impulse Wheel 17 by aspring 35. Arm 37 is pivotally of the pawl 33 carries a roller 38 of insulating material which is arranged to actuate spring 39 to open the contact between this spring and a spring 40 each time the pawl 18 is engaged by a tooth of the impulse Wheel17. These springs 39 and 40 are in series with the line circuit so that an interruption is produced therein each time the pawl 33 is actuated by impulse wheel 17. Springs 39 and 10 and springs 41 and 12 are suitably mounted on. but insulated from. the back of the frame 1. A terminal strip 60, to which the line conductors may be connected, is also provided on the back of the frame 1.

to the frame 1 pawl 18 is arranged to Other details of construction will be urn derstood from the following description of the mode of operation of the device.

If it is desired to send out. for instance impulses c n-rcsp mding to the number "3, a finger is placed in the finger hold 1. opposite which the numeral appears. and the dial is rotated in a clockwise direction. 'hen the finger engages the finger stop 22. the stop is rotated clockwise with the dial until the arm 2-1 engages the from end of the slot 25.

In response to the actuation of the dial 3. shaft 2 and locking disk 6 are rotated clock wise, and the spiral spring 11 is wound up. This puts a tension on the impulse wheel 17. tending to rotate it in a clockwise direction. but this wheel prevented .f'rom rotating by the end 70 of the pawl 18. This end is held in the teeth of the impulse wheel 17 by the cam 27 on the finger st p -32. When the finger stop 2" is rotated by the operators finger the arm 32 of the pawl 18 is moved into the notch 50 of the stop by spring 21. The end 70 of the pawl out of engagement with the teeth of the impulse wheel 17, the other end 20 of the pawl is moved into engagement with the teeth 7 of the locking disk 6, and the arm ll. carrying the roller 43, is operated to clo e the rontacts between springs 11 and 42. These springs may be connected to the telephone set in such a manner as to short-circuit it while impulses are being sent.

Impulse wheel 17, with gear wheel 16 and cup-shaped sleeve 13, is thcnfrotated clockwise by the spiral spring 11. The gear wheel 16 meshing with a pinion -15, causes a spindle 46, mounted in the front and back of the frame 1, to rotate in a counter-clockwise direction. Fastened to the spindle -16 is agear wheel 17 which transmits the motion of gear wheel 16 to pinion 18 of the speed governing mechanism, and rotates the spindle 19 of the governor in a clockwise direction, and this operates the speed governing mechanism contained in the cup 55 for regulating the speed of' the impulse wheel. The governor mechunism'may be any of the well-known types, the type shown being similar to that described in Patent No. 1.1615381 to t). F. Forshcrg.

Impulse wheel 17, in rotating, vibrates the arm 37 of the pawl 33 to open the contact between springs 39 and 4-0. In the device shown. in transmitting the number 3, said spring will be opened and closed four times, resulting in the sending of four impulses which may serve to govern a switch in its selective movmnent in a well-known manner.

The cup-shaped sleeve 13, carrying the impulse wheel 17 and the gear wheel 16, continues to rotate until a stop pin 51, which is fastened to the gear wheel 16, comes in contact with arm 9 of the disk 10. The disk 18 is thereby movcd' and the cam plate 12 are moved thereby until the arm 9 engages the front end of the "slot 8 in the locking disk 6. Since the locking disk 6 islocked at this time by the end of the pawl 18, further rotation of the cup-shaped sleeve and the wheels carried thereon is prevented.

The rotation of the cam plate 12 causes the pawl 29 to ride over the-teeth of cam plate 12. The pawl 29 is suflicientlv rotated about its pivotby th's movement to cause the arm 31 to unlock t e finger stop 22. The stop 22 is then returned to its normal position by the spring 23.

I \Vhen the finger stop moves back to its normal position, cam 2 thereon causes the end 20 of the pawl 18 to move out'of engagement with the teeth of the locking wheel 6, causes the end 70 of the pawl to move into engagement with the teeth of the impulse wheel 17 and causes the arm 44 to open the contact betweensprings 41'and 42. The sender is then ready for another operation.

'hat is claimed is: I

1. In a calling device; a rotatable shaft, a dial and a toothed wheel rigidly secured to 'said shaft. an impulse wheel. a movable arm arranged to engage said impulse wheel and said toothed wheel respectively, and a finger stop arranged to limit the forward rotation of the dial and to control said movable arm.

2. In a calling device. a rotatable shaft, a dialiand a toothed wheel rigidly secured to said shaft. an impulse wheel, a movable arm normally in engagement with said impulse wheel. and a finger stop arranged to remove said arm from engagement with said impulse wheel and to place itin engagement with said toothed wheel.

3. In a calling device. a rotatable shaft. a dial and a toothed wheel rigidly secured to said shaft, an impulse wheel. a movable arm having means integral therewith for engaging said impulse wheel and said toothed wheel respectively, and a finger lever arranged to limit the forward rotation of the dial and to control said movable arm.

4. In a calling device, a rotatable shaft. a dial and a toothed wheel rigidly secured to said shaft, an impulse wheel, means for operating said impulse wheel. a movable arm having means-integral therewith and arranged to engage said impulse wheel. to prevent operation thereof during the operation of said dial and having means integral therewith and arranged to engage said toothed wheel to prevent the operation of said dial during the operati n of said impulse wheel. and a finger lever arranged to limit the forward rotation of the dial and to control said movable am.

In witness whereof. I hereunto subscribe my name this 28th day of December A. D.. 1916.

OSCAR F. FORSBERG. 

